225138858 has 64 divisors (see below), whose sum is σ = 551577600. Its totient is φ = 59856192.

The previous prime is 225138857. The next prime is 225138877. The reversal of 225138858 is 858831522.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (225138857) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 32593 + ... + 38891.

It is an arithmetic number, because the mean of its divisors is an integer number (8618400).

Almost surely, 2^225138858 is an apocalyptic number.

It is a practical number, because each smaller number is the sum of distinct divisors of 225138858, and also a Zumkeller number, because its divisors can be partitioned in two sets with the same sum (275788800).

225138858 is an abundant number, since it is smaller than the sum of its proper divisors (326438742).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

225138858 is a wasteful number, since it uses less digits than its factorization.

225138858 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 6371.

The product of its digits is 153600, while the sum is 42.

The square root of 225138858 is about 15004.6278860890. The cubic root of 225138858 is about 608.3452941832.

The spelling of 225138858 in words is "two hundred twenty-five million, one hundred thirty-eight thousand, eight hundred fifty-eight".